chore(release): gate users-branch features for hotfix

Add USERS_BRANCH_FEATURES_ENABLED (off by default) to hide Players library, session tokens, and related UI while keeping the preview import fix. Restore primary Run button when the flag is off.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/renderer/control/ControlApp.tsx

@@ -5,6 +5,7 @@ import { pickEraseTargetId } from '../../shared/effectEraserHitTest';
 import { fitAspectRect } from '../../shared/geometry/fitAspectRect';
 import { ipcChannels } from '../../shared/ipc/contracts';
 import type { SessionState } from '../../shared/ipc/contracts';
+import { USERS_BRANCH_FEATURES_ENABLED } from '../../shared/features/usersBranchFeatures';
 import {
   isNodeInMainStoryline,
   isNodeInSideStoryline,
@@ -1778,6 +1779,8 @@ export function ControlApp() {
           <div className={styles.previewHeader}>
             <div className={styles.previewTitle}>{t('control.screenPreview')}</div>
             <div className={styles.previewActions}>
+              {USERS_BRANCH_FEATURES_ENABLED ? (
+                <>
               <label className={styles.npcTokenScale}>
                 <span className={styles.npcTokenScaleLabel}>{t('control.npcTokenScale')}</span>
                 <input
@@ -1816,6 +1819,8 @@ export function ControlApp() {
                     ? t('control.hidePlayers')
                     : t('control.showPlayers')}
                 </Button>
+              ) : null}
+                </>
               ) : null}
               <Button onClick={() => void api.invoke(ipcChannels.windows.closeMultiWindow, {})}>
                 {t('control.stopPresentation')}
@@ -2026,7 +2031,7 @@ export function ControlApp() {
                     }}
                   />
                 ) : null}
-                {previewContentRect ? (
+                {USERS_BRANCH_FEATURES_ENABLED && previewContentRect ? (
                   <SceneNpcTokensOverlay
                     placements={currentScene?.npcTokens ?? []}
                     library={session?.project?.npcs ?? []}
@@ -2046,7 +2051,7 @@ export function ControlApp() {
                     }}
                   />
                 ) : null}
-                {previewContentRect ? (
+                {USERS_BRANCH_FEATURES_ENABLED && previewContentRect ? (
                   <ScenePlayerTokensOverlay
                     library={appPlayers}
                     session={scenePlayerTokensSession}
@@ -2509,7 +2514,7 @@ export function ControlApp() {
         ) : null}
       </div>
 
-      {npcSessionCtxMenu
+      {USERS_BRANCH_FEATURES_ENABLED && npcSessionCtxMenu
         ? createPortal(
             <>
               <button